What is an astronomical unit?
A) the average speed of Earth around the Sun
B) the length of time it takes Earth to revolve around the Sun
C) the average distance from Earth to the Sun
D) the diameter of Earth's orbit around the Sun
E) any basic unit used in astronomy
C
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A mass sits at rest on top of a table. Which two forces are interaction pair forces and thus are equal and opposite?
A. the force of gravity on the mass due to the earth and the force of gravity on the earth due to the mass B. the force of gravity on the mass due to the earth and the contact force on the table due to the mass C. the contact force on the mass due to the table and the force of gravity on the earth due to the mass D. the force of gravity on the mass due to the earth and the contact force on the mass due to the table
Hadrons are particles that interact via the strong force
a. True b. False Indicate whether the statement is true or false
If a calculated quantity has units of T ? m/A, that quantity could be
A) an electric field. B) an electric potential. C) ?0. D) a magnetic field. E) a magnetic torque.
Although it hasn't been observed (yet), why do astronomers think that the Milky Way is embedded in a halo of dark matter?
A. Due to its large size, the light from stars on the other side of the Milky Way has not reached us yet. B. Stars in the outer regions of the Galaxy are orbiting faster than expected. C. Astronomers have detected neutrinos from unseen sources. D. Theory predicts that there should be more black holes than we've so far detected.